Apparatus for extracting soluble constituents from vegetable, animal, or mineral substances.



H, KAIVINSK & F. C. NIEDERHAUSER, In.

APPARATUS FOR EXTRACTING SOLUBLE CONSUTUENTS FROM VEGEABLE, ANIMAL, OF.'

MINERAL SUBSANCES.' APPLICAIIUN llLtU JAN: i9, |912,

Patented Nov. 23, 1915.

2 SHEETS-SHEET l.

MATTORNEYS.

i H. KAMNSKi & F. C. Ni'EDERHAUSER, Jn. APPARATUS FOR EXTRACTING SOL`UBLE CONSTITUENTS FROM VEGETABLE, ANIMAL, GR

MINERAL SUBSTNCES. www5.

APPLICMIUN FILM) 1AN.19. 1912.

men-red Nov. i915.

,S/ M- s.

WITNESESI v INVENTURS i 'iin 'n rr HAROLD KAMINSKI, O'F GEORGETOWN, SOUTH CAROLINA, AND'FREDERIGK C.

NEDERI-IAUSER, UR., OF PATERSON, NEW JERSEY.` i

APPARATUS FDR EXTRACTING SOL'UBLE CONSTITUENTS FROM VEGETABLE, ANIMAL,

OR MINERAL SUBSTANCES.

maries.

To all lwhom it may concern:

Be it known that we, HAROLD KAMINSKI and FREDERICK C'. NinDEnHAUsnn, Jr., citi- 1 Zens ofthe United States, and residents, re-

spectively, of Georgetown, county of George` town, and. State of South Carolina, and Paterson, countyof Passaic, and State of New.

Jersey, have invented a new and useful lmproveinentin Apparatus for Extracting Seb uble Constituents from Vegetable, Animal, or iflineral Substances, of which the following is a specification.` l

.Uur invention relates to apparatus for eX- tracting soluble constituents from vegetable, animal, or mineral substances, and more particularly Vto apparatus for extracting resin from crude rubber by mixing the rubber with suitable solvents.

rlhe obj ect of our invention is to provide simple and eilicient apparatus by means of whichy rubber may be rapidly thoroughly and continually'de-resinated, and by which.

the solvent may be recovered and again4 used without waste. f

ln carrying out our invention, we provide one or more mixing chambers to which the rubber and resinous solvents may be continuously fed and through which chamber we use two or more mixers through each of which theA rubber is run, the mixers being continuously and simultaneously operated.

@ur invention will be more readily understood .and the objects and advantages of lthe saine will more fully appear from. the following` description taken in connection with the accompanying drawings forming apart of this specification, and in which- Figure 1 shows a side elevation of the vcomplete apparatus for de-res'inating rubber, certain parts of which are broken away or shown in section; Fig. 2 isa centrallongitudinalx view ofxone of. tlieunixing chambers shown inFig. 1;.'andFig- 3- isa crossa Specification of Letters Patent.` Patented Nov., 23. 1915, Application led January 19., 1912. Serial No. 672,249. i i l v sectional view ofthe same, taken on the line A-A' of Fig. '2.

Referring to the drawings, #Fig l isa;

horizontal inclosed chamber of'genelal cylindrical shape, comprising a' cylindrical portion proper 2 and an'uppei loffset portion 3, and within the chamber weprovi'de a screw conveyer l for simultaneouslvmixing the rubber and. solvent and conveying the rubber through the chamber. The screw is secured on a shaft 5 in any ksuitable.man-

Y' ner, and. the shaft extends throughopenings 6 and 7 in the ends ofthe chamber, and is journaled in bearings `S and 9'. v.lhe'outer edgesv of the screw are preferablyslightly curved forwardly, as shown atlO, Fig. 3, to more thoroughly miv` the. rubber by a scooping action which turns a part 'of the mass of rubber back upon itself as the lscrew lifts the rubber in inmingitjalong.l The shaft is also provided witli'la plurality `of pins or yarms 11 for engagingrthe lnassgof rubber between the different convolutionsv .to break it up as the shaft is rotated. l I' The rubber is fed throi'igh ahopperll by any suitable means, such as by a propeller or short screw 13 the blades ofwhich are arranged to engage the rubber ,in thejl hopper and force it downward. .The discharge end of the chamber. is tapered, asV shown aty 14, and the adjacent end of the screw is alsoltaperedV to conform to the'contour of the cham'- ber at this point; and the opening `6 at this point through which the shaft passes `is made large enough for thedischarge of the rubber therethrough.` l The taper at this point provides an inclined bottom wall upon ywhich the rubber may be .forced'before itisdischarged, so as to permit a slight'paking of the rubber and the draining ofl the solvent therefrom beforeit is discharged.i j

Solvent is supplied tothe mixing cham-- ber from'one or inore'tanksor stillsl--lQ inclosed in suitable jackets ll-1.16 and pose of vaporizingthe solvent( ,Theltanks are provided with thermometers 184%-,18 and with liquid gages 19-19 and with manholes QOf-QO through which tanks 'fare cleaned,'as hereinafter described. ',Fr'om the tanks lead pipes 21---21 to a '.i'nain. pipe 522 which, in turn, leads to a condenser 2 3'. "The pipes 2l-21 and 22 are`| suitably jacketed in order that the `solvent yvapor may be' conioo 1 most expedient.

veyed therethrough without condensing. The pipes may be simply covered with an asbestos jacket, or they may be heated in anysuitable manner and covered, as may be The condenser 23 is preferably in the form of a cylindrical tank into one end of which the pipe 22 enters, the pipe being provided withv a' nozzle 24 preferably7 located beneath the level of the 'solvent in the Condenser. The condenser, if desired, may

be surrounded byV a cooling coil 25 or other suitable apparatus, butif the tank is of the .o1-03er size.'no coolino'a aratus may be needed. A pipe 2G of comparatively small diameter, about one-fifth'the size of pipe 22, leads from the bottom4 of the condenser to the mixing chamber 2, and is provided ewith a valve 27. 1 The pipe 26 v-is connected at its vend to one or more horizontal pipes or branches 28 which are located within the offset or hood portion 3 of the chamber and :extend longitudinally thereof, and are each provided with a series of nozzles 29 through which the solvent issprayed down upon'the rubber. The pipes may. 'be provided with separate nozzles, as shown, or openings may f simply be made in the pipes Without inserting nozzles therein, as may be desired, but

We prefer to use separate-nozzle pieces and tospace the nozzles-on the different pipes so that the nozzles on onepipe will be in staglg'ered're'lation with' respect to those on the i, f adjacent pipe; and we prefer to graduate the opening of the nozzles, placing the smaller nozzles at `the tapered end of the 'apparatus extending longitudinally of the champer b ut in an enlarged or offset portion thereof-to provide a suitable space-between lthe nozzles and the screw to prevent the formerfrom being clogged, forms one important feature of'our invention. The mixing chamber 2 is inclosed in any suitable jacket such as an asbestos jacket 30, and the chamber is heat-ed in lany suitable manner such "as by steam pipe 31 heat being evenly A distributed to the bottom of the chamber through an iron mass, as shown, the iron being a good heat conductor. v In order to return the spent solvent from the chamber to the tanks15-15,` we provide an overflow pipe 32 connectedtothe y15-15 and lieatapplied thereto.

'vent beyond a predetermined amount. We

prefer to maintain a depth of about four to six inches of 'solvent in the bottom of the mixing chamber, and in the present form of our invention, we connect pipe 32 at the tapered portion of the chamber so that the opening of the pipe into the chamber is about six inches above the bottom wall of the chamber. T he pipe 32 is provided with a suitable valve 33 and below this valve is connected a pipe-3tleading to pipes 35-35 which empty into the tanks 15-15.

Where two mixing chambers are used in series through which the rubber is run, we provide a trough 3S which guides the rubber as it is dumped from the discharge opening 6 of the first mixer into the hopper 12 of the second mixer. The second mixer is arranged and constructed substantially as the first mixer above described, except that we prefer to slightly incline the second or last mixing chamber so that lthe solvent will be more thoroughly drained from the rubber, and we preferably omit the heating coils from the discharge end of this chamber to allow the rubber to be partially cooled before it is discharged. The spraying nozzles are alsopreferably omitted from this end of the chamber to allow the rubber to partially dry out before being discharged. We connect the solvent overflow pipe 32 at the charging end of this chamber and at such a distance above the bottom o'r'- the chamber as will insure the proper depth of the solvent therein. The height above-'the bottom of the chamber at which the overflow pipe 32 is to be connected will depend upon the angle at which the chamber is inclined. The arrangement and connections should besuch that therewill bev no solvent within'about six feet of the discharge end of the last mixing chamber. The overflow pipe 32 connects with pipes 3,5*35 through 4which the solvent is conveyedfrom the last chamber into the tanks 15--l5.

The operation of the preferred form of apparatus above described, is as follows: A suitable solvent, such as acetone, acetone oils, methyl acetone, methyl alcohol, or a mixture of methyl alcohol and acetone; or any other known solvent or combination of solvents, is poured into one of the tanks XS the solvent evaporates, it passes through the pipes 21 and 22 to the condenser 23 where it is condensed until a suitable amount of the hot solvent forms in the condenser 23, whereupon the valve 27 is opened and the solvent is delivered to the spraying pipes 28 under pressure.

Crude rubber, such. as guayule, or Para rubber, is then emptied into the hopper 12, the rubber, if guayule rubber, being in the form of small globules, and if Para rubber,

therefrom. v

' the shaft,thus assisting in the mixing of the rubber with the solvent which is being sprayed down upon it. The arms or pins 1l. at the same time beat or strike into the body `of rubber between the different convolutions of the screw, thus breaking it upv into smaller bodies, lso that by the time the rubber reaches the discharge `end of the conveyer, it has been thoroughly mixed and saturated with the solvent, which dissolyes out the resin The length of the mixing chamber and screw will vary with the number of chambers used and the particular grade of rubber being treated, and will depend upon the percentage of resin which is required to be extracted from `the rubber. Ordinarily, in the treatment of guayule rubber for the usual market, we prefer to use two chambers, eachl about thirty'feet long, and we prefer to make the screw of comparatively short pitch so that the rubber will move slowly through the chamber. The total length of mixing chamber, whether there be a single.

chamber or'two or-more used, and the pitch of the screw, -should be such that the rubber will be under treatment Jfor a period of `from thirty to sixty minutes, depending upon the particular rubber under treatment and the percentage of resin necessary to be extracted therefrom. l

The4 rubber in being forced up the tapered portion of the chamber is put under slight pressure, and the'solvent is 'given an opportunity to.' drain down the inclined wall so that the rubber may not carry too much of the resin-saturated solution with it. The rubber then is guided through the trough or sp'o'ut 38 intothe hopper 12 of the second mixing` chamber through which it is conveyed and treated in the manner )ust de# scribed. 'The discharge end of this mixing chamber is preferably tilted at a slight angle, andino spraying nozzles are provided l near this end, so that as much of the solvent as possibleis squeezed out of and drained from the rubberbefore ,it is discharged from the final mixer. y

As the resin-saturated solvent reaches a predetermined depth in the chambers, it is returned through thepipes to whichever-.ot

the tanks-15 or' 15 happensto be in use, where it'is again evaporated, etc; When the solutionin either tank becomes too thick due to residual res-in `from continuous redistillation', the heat from beneath that tank is cut off and heat issupplied to the other tank..

while the first tank is emptied through pipe 39, after which the tank may be cleaned through. the manhole.

Due to the oily nature oi' crude rubber it maybe desirable, when starting up the operation, to first supply solvent to the mixing' chamber which contains a certain percentage of resin in solution for vthe purpose of` more readily wetting7 the rubber with the` sola.

vent. The dissolved resin in the solvent causes 1t to more readily wet the rubber than `it' the pure distilled solvent were Iirst used, and for this purpose we provide a tank et),

having' a pipe 41 leading therefrom to the first mixing chamber 1, the pipe being provided with a valve 42. Before starting up the cle-resinating process the valve. 42 .is opened and a certain amount ot the solvent containing a suitable percentage of resin dissoljved therein, is delivered from the tank 40 to the mixing chamber after which the valve 42 is closed and pure solvent is then supplied to the chambers from the tanks l5, 15. i

Having thus fully described our inven tion, what we claim .as'new and desire to`- se;- cure by Letters Patent, is: l. In apparatus of the character de scribed, the combination of a horizontal, lat-I erally `closed cylindrical mixing chamber having an opening at oneend through which material. to be treated is emptied into the chamber, and having an axial-discharge opening at the other end, a tank for a sollvent, a pipe connecting kthe tank and upper part of the chamber for conducting solvent to the latter, means for heating said tank to vaporize the solvent, means connected with said pipe and extending alongvthe chamber within the same for discharging solvent along the length of the chamber upon the material therein, a condenser in the connecting pipe between` lthe tank and `the chamber 'For condensingthe vaporized solvent, means for heating saidchamber, a screw in the chamber for-mixing .thefinate` rial with the solvent and moving it through the chamber to the discharge opening while it is .being mixed, and a return pipe con; .1,

necting, thechamber and tanka and through which the spent solvent is returncdto the tank.' ,v

2. ln apparatus of the character described` the combination of a horizontal, lat,-V erally closed cylindrical-inixing chamber vhaving any opening` at one end through which lio within the same for discharging solvent along the length of thechamber upon the vmaterial therein', a condenser in the lconlby gravityto the tank.

3. In apparatus of the character describes the combination of a horizontal, laterally closed cylindrical mixing chamber having an opening at one end through which. material to be treated is emptied into the chamber, and having a tapered end portion with an axial discharge opening, a tank for a solvent, a pipe connecting the tank and upper part of the chamber for conducting solvent to the latter, means for, heating said tank "to vapori'ze the solvent, means connected with said'pipe and extending along the chamber Within the same for discharging solvent along the length of the chamber upon the material therein, a condenser in the connecting pipe for, condensing the' vaporized solvent, means for heating said chamber, a crevv in the chamber for mixing the material `With the solvent and moving it through the chamber to the discharge open.- ling While it is being mixed, and a pipe connected to the chamber above the bottom thereof and leading to the tank, through which pipe excess solvent is returned from the chamber to the tank.

4. In apparatus of the character described, the combination of a horizontal, laterally closed cylindrical mixing chamber having an opening at one end through which material to be treated is emptied into the chamber, and having an axial discharge opening at the other end, said chamber also having an offset portion, a spraying pipev within said offset portion, a tank for a solvent, means for heating the tank to vaporize the solvent, a pipe connecting the tank and spraying pipe f or conducting solvent to the latter, 4means for heating said mixing chamber, and a screw in the chamber for mixing the material with the solvent and moving it through. the heated chamber to the dis- 'charge opening while it is being mixed.

5. In apparatus of the character described, the combination of a horizontal., laterally closed cylindrical mixing chamber having an opening at one 4end through which material to be treated is emptied into the c liamber, and having an axial discharge opening at the other end, said chamber also having an offset top portion running longitudinally thereof and provided with a` spraying pipe extending longitudinally therein, a tank .for a solvent, means for heating said tank to vaporize the solvent, a pipe con necting the tank with the spraying pipe for conducting the solvent to the latter, a condenser in said pipe connection for condensing the vaporized solvent, and a screw in the chamber for mixing the material with the solvent and moving it' through the chainber to the discharge opening while it is being mixed.

6. In apparatus of the character described, the combination of a horizontal, laterally closed cylindrical mixing chamber having an opening at one end through which material to be treated is emptied into the chamber, and having a tapered portion at the other end with anl axial discharge `opening, saidchamber also having an otl'set top portion running longitudinally thereof and provided with a spraying pipe extending longitudinally therein, a tank for a solvent, means for heating said tank to vaporize the solvent, a. pipe connecting thel tank with thc spraying pipe for conducting the solvent to the latter, a. condenser -iii said pipe connection for condensing the vaporized solvent, a. screw in the chamber for mixing the material with the solvent and moving it through the chamber to the' discharge open'- ing While it is being mixed, and a pipe connected to the chamber above the bottom thereof leading to the tank, through which pipe excess solvent is returned to the tank.

7. In apparatus of the character described, the combination of a horizontal, laterally closed cylindrical mixing chamber having an opening at one end through which material to be treated is emptied into the chamber, and having an axial discharge opening .at the other end, and also having an offset portion at the top thereof extending longi* tudinally thereof, a spraying pipe Within said offset portion arranged longitudinally thereof for spraying solvent on the material to be treated, a tank for the solvent, ,means for lheating the tank to vaporize the solvent, a. pipe connecting the tank and the spraying pipe for conducting solvent from the tank to the latter, a condenser in said pipe connection of sullicient capacity to maintain a substantial amount of solvent, the portion of said pipe between `thecondenser and the chamber being relatively small in diameter as compared with the portion of the pipe between the condenser and the tank to maintain a substantial amount of solvent in the condenser.

. 8. In apparatus of the cha ractei' described, the combination of a. plurality of horizontal, laterally closed cylindrical lmixing chambers arranged in series, each chamber having an opening at one end through which material to be treated isemptied, and having a, disnicmar charge opening at the other end .for said material after it is treated, a tanli for a solvent, means for heating said tank to vaporize thev solvent, pipes leading from said tank to the mixing chambers, a condenser in each of said pipes for condensing the vaporized solvent, means for'heating the chambers, a screw in each chamber for mixing the material therein with the solvent and moving it through the chamber to I the discharge' opening while "it is being f mixed, and pipes connected to the mixing chambers above the floor thereof and leadingft'o the'tank through which pipes excess l-solventis returned to the tank.

9. ln apparatus of the character described,

vthe combination of a horizontal, laterally 4closed Acylindrical mixing chamber having an opening at one end through which material to be treated is emptied into the chainber and having an inclined end portion` with a discharge opening thereat, a. tanlr forl a solvent, means for. heating the tank to vaporize the solvent, means connecting the ing to mix the material as the screw is rotated.

` 10. In .apparatus of vthe character described the` combination of a horizontal, laterally closed cylindrical mixing chamber having an opening at one end through which the material to be treated is emptied into the chamber, and having an axial discharge opening at the other end, a tank for a solvent, means for heating said tank, means connecting the tank and chamber for conducting. solvent to the latter, means for heating said mixing chamber, a screw in the chamber for mixing the material with the solvent and inoving'it through lthe heaty.ed chamber to the discharge opening while `Ait is being mixed, the outer edge of said .screw being forwardly curved, and arms extending from the axis of said" screw and 'serving to mix the material being treated.

ll. in apparatus of the class described, comprising a horizontally arranged cylinf. drical chamber, having au offset portion at ithe' top part thereof, a spraying device exl,tending horizontally in said offset portion, .60]

said .chamber having an exit opening at one end, and a screw for mixing the contents of the chamber and forcing them gradually through the exit opening during the mixing operation. l l

12. An apparatus ofthe class described,

comprising a horizontally arranged cylindrical chamber having an offsetv portion at the top part thereof, a spraying device exmtending horizontally in said oifset portion, said chamber having an exit opening at one end, and a screw for mixing the contents of the chamber and forcing them gradually through the exit opening during the mixing operation, the edges of Said screw being curved forwardly adjacent the periphery of the chamber.

13. An apparatus o-f the class described, comprising a horizontally arranged cylindrical chamber, a spraying device in said chamber, said chamber having an exit opening at one end, and a screw for mixing the contents of the chamber and forcing them gradually through the exit opening'during the mixing operation. the edgesl of said screw being curved forwardly adjacent the periphery of the chamber.

ll. An apparatus of the class described,

comprising a horizontal chamber having tivo outlets therein one for liquid and one for solid material, the outlet for the solid material being above the outlet for the liquid material, means for continuouslyr supplying liquid to said chamber, the height of the liquid in said chamber being limited bythe constant overflow thereof into the liquid outlet, and means in. said' chamber for mixing solid material with the liquid and gradually progressing the solid material toward and through Said Solid material outlet while fresh solid material is introduced and being mixed.

15. An apparatus of the class described, comprising a horizontal chamber having two outlets therein one for liquid and one for solid material, the outlet for the solid material being above the outlet for the liquid material, means for continuously `supplying liquid to said chamber, the height of the liquid in said chamber being limited by the constant overflow thereof into the liquid outlet, and means in said chamber for mixing solid material with the liquid and'gradually progressing the solid material toward and through said Solid material outlet while fresh solid material is intro-duced and being `.nfiixiah said chamber being provided with an upwardly inclined path adjacent the solid material outlet whereby the solid material is raised `above the surface of the liquid before it leaves the chamber to drain 'the'sama 16. An apparatus for deresinating rubber, comprising a horizontal chamber, having two outlets therein one' for the solvent and. vone for the rubber, the outlet for the rubber being above the outlet for the Solvent, means for di scliarging the solvent overthe rubber in the chamber, the height of the solvent' in the chamber being limited by the constant overflow thereof into the solvent outlet, means for continuously feeding the raw rubila ber into the chamber at its end opposite the rubber outlet. and means in the chamber for mixing the rubber and solvent and gradually and constantly progressing the rubber toward and through said `rubber outlet whilefresh rubber is being introduced and mixed.

17. An apparatus for deresinating rubber,

Comprising a horizontal chamber, having two outletstherein one for the solvent and one 'for the rubber, means for discharging .the solvent, over the rubber in the chamber,

the'height of the solvent in the chamberbe- `ing limited by the constant overflow thereof into the solvent outlet, means for feeding the raw rubber into the 'chamber at its end 'opposite the .rubber outlet, and means vin the chamber for mixing the rubber and solvent and progressing the rubber toward andthrough said rubber outlet Vwhile fresh rubber is being introduced and mixed.

18. An lapparatus of the class described,

comprising a plurality of horizontal cham-- from the rubber outlet of one chamber to the rubber inlet of the next chamber, 'and means in each chamber for mixing the rubber and solvent and progressing the rubber therein toward and through its rubber outlet .while fresh 'rubber is being introduced and mixed. I

19An apparatus of the class described, comprising a horizontal chamber having a rubber vinlet at-one end and a rubber outlet at the opposite end, a series of spraying noz- Zles arranged in a lhorizontal row longitudinally of the chamber and in the upper part of the chamber for spraying a solvent into the chamber, said nozzles decreasing in size toward the rubber outlet end of the chamber, means for limiting the height of the solvent in the chamber to a point below the rubberoutlet, and means for mixing the 'rubber and solvent in the chamber and progressing the rubber toward and through the rubber outlet while fresh rubber is beingintroduced and mixed.

20. An apparatus of the lclass described, comprising a horizontal chamber having a rubber inlet at one end and a rubberoutlet fat the opposite end, a series of spraying' nozzles arranged in a-horizontal row longitudinally' of` the 'chamber and in the upper part ofthe chamber for spraying a solvent into 1 the chamber, said nozzles decreasing 1n size toward the rubber outlet end of the chamber, and means for mixing the rubber and solvent in the chamber and progressing the rubber toward and through the rubber outlet while fresh rubber is being introduced and mixed. 2l. An apparatus of the' class described,

comprisin'ga plurality of horizontal cham bers each having a rubber inlet at one end land a rubber outlet at the opposite end, 4means for supplying each' chamber with liquid solvent and limiting the height of the solvent in the chamber to a. point belowV said rubber outlet, means for feeding the rubber from the rubber outlet of one chamber to the rubber inlet of the next chamber, 'means in each chamber for mixing .the rubber and solvent and progressing'the rubber therein toward and through its rubber outlet While fresh rubber is being introduced and mixed, .and means for heating the first chamber, the

last heating'chamber of -the series being' without heating means.

22. An ,apparatusof the class described, comprising a horizontal' chamber having a rubber inlet at one end and a rubber Outlet at the opposite end, means for supplying the.'

chamber with Iliquid solvent, means for limiting the height of the solvent in the chamber to a point below the rubber outlet, means for mixing the rubber and solvent in the chamber and progressing the rubber to-y ward and through the rubber outlet while fresh rubber is beingintroduced and mixed,

`heating coils below said chamber, and .an

iron mass arranged to conduct the heat from vsaid coils to the bottom ofthe chamber and supply it 4evenly thereover, substantially as described..

23. Anapparatus of the class described, comprising a horizontal chamber having la rubber inlet at one end and a rubber outlet at the opposite end, means for supplying the chamber with liquid solvent, means for mix:l ing the rubber .and solvent in. the chamber, heatingcoils below said chamber, andan iron mass arranged toconduct the heat from.

said coils to the bottom of the chamber and supply it evenlyfthereover, substantially as described.

24. In apparatus for deresinating rubber, 'the combination with a horizontal cylinder, adapted to' retain a body of liquid, having at one end an opening for the .introduction of rubber to be treated and provided atv lts opposite end vwith an upwardly, inclined surface leading to a discharge opening-for rubber, of means forv introducing liquid solvent into the cylinder, means for maintainmg the v'surface ofsuch liquidbelow ysaid opening, a

screw in the cylinder for mixingthe rubber and solvent and progressively forcing, the former up said inclined surface out ofthe liquid and out of said opening.

. 25. In apparatus for deresinating rubber, the combination with a horizontal cylindrical chamber adapted to retain .a body of liquid and provided at one end with an opening adapted for constantly introducing rubber to be treated and at its opposite end having its walls converging to an axial discharge 'opening for rubber, of means for con Llei/,135 W stantly supplying liquid solvent in said. names to this specification, in the presence of chamber, means fork; maintaining the level of two subseribing Witnesses. liquid in the oham er beloW said opening a v screw approximately tting in said chamber- HAROLD KAMINSKL 5 and having its spiral Wing provided with va Wltrsss 'CAMPBELL marginal forwardly projecting flange and J'RS AN J, adapted, as a Whole, to mix the materials I. 1" in the chamber and uninterruptedly force FREDERlCK C. NIEDERMUSER, JR. Y the rubber forward, upwardly out of the Tviitnesses: l() liquid and through said opening. SAMUEL M. "WARD, Jr.,

In testimony whereof, We have signed our EDWIN SEGER. 

